diff --git a/actions/setup/js/check_daily_aic_workflow_guardrail.cjs b/actions/setup/js/check_daily_aic_workflow_guardrail.cjs
index 34024b592f0..a61a5332309 100644
--- a/actions/setup/js/check_daily_aic_workflow_guardrail.cjs
+++ b/actions/setup/js/check_daily_aic_workflow_guardrail.cjs
@@ -223,6 +223,12 @@ function renderDailyAICSummary(workflowName, actorLogin, threshold, countedRuns,
           .join("\n")
       : "| _none_ | — | — | 0 |";
 
+  const noRunData = stats.count === 0;
+  const totalAICFormatted = formatAICCredits(stats.total) || "0";
+  const avgAICFormatted = noRunData ? "—" : formatAICCredits(stats.average) || "0";
+  const stddevAICFormatted = noRunData ? "—" : formatAICCredits(stats.stddev) || "0";
+  const minMaxAICFormatted = noRunData ? "— / —" : `${formatAICCredits(stats.min)} / ${formatAICCredits(stats.max)}`;
+
   const noteLines = [];
   if (meta.truncatedByRateLimit) {
     noteLines.push(`- Stopped early to preserve GitHub API rate limit headroom (${rateLimit.remaining} remaining, reserve ${RATE_LIMIT_RESERVE}).`);
@@ -236,14 +242,14 @@ function renderDailyAICSummary(workflowName, actorLogin, threshold, countedRuns,
     "",
     "| Statistic | Value |",
     "| --- | ---: |",
-    `| 24h total AIC | ${formatAICCredits(stats.total)} |`,
+    `| 24h total AIC | ${totalAICFormatted} |`,
     `| Threshold | ${formatAICCredits(threshold)} |`,
     `| Threshold used | ${usagePercent}% |`,
-    `| Remaining headroom | ${formatAICCredits(remainingBudget)} |`,
+    `| Remaining headroom | ${formatAICCredits(remainingBudget) || "0"} |`,
     `| Runs counted | ${formatInteger(stats.count)} |`,
-    `| Avg AIC / run | ${formatAICCredits(stats.average)} |`,
-    `| Std dev AIC | ${formatAICCredits(stats.stddev)} |`,
-    `| Min / Max AIC | ${formatAICCredits(stats.min)} / ${formatAICCredits(stats.max)} |`,
+    `| Avg AIC / run | ${avgAICFormatted} |`,
+    `| Std dev AIC | ${stddevAICFormatted} |`,
+    `| Min / Max AIC | ${minMaxAICFormatted} |`,
     `| API remaining | ${formatInteger(rateLimit.remaining)} / ${formatInteger(rateLimit.limit)} |`,
     `| API used | ${formatInteger(rateLimit.used)} |`,
     `| API reset | ${rateLimit.reset || "unknown"} |`,
diff --git a/actions/setup/js/check_daily_aic_workflow_guardrail.test.cjs b/actions/setup/js/check_daily_aic_workflow_guardrail.test.cjs
index 0d0da854603..4678888a504 100644
--- a/actions/setup/js/check_daily_aic_workflow_guardrail.test.cjs
+++ b/actions/setup/js/check_daily_aic_workflow_guardrail.test.cjs
@@ -98,6 +98,36 @@ describe("check_daily_aic_workflow_guardrail", () => {
     expect(exports.formatDailyGuardrailLogMessage("Completed AI Credits inspection window")).toBe("[daily-workflow-aic] Completed AI Credits inspection window");
   });
 
+  it("renders a daily AI Credits summary with zero counts when no prior runs are in the 24h window", () => {
+    const markdown = exports.renderDailyAICSummary(
+      "Impact Efficiency Report",
+      "mnkiefer",
+      5000,
+      [],
+      {
+        remaining: 13194,
+        limit: 15000,
+        used: 1806,
+        reset: "2026-06-10T07:07:04.000Z",
+      },
+      {
+        candidateRunsCount: 0,
+        inspectedRunsCount: 0,
+        truncatedByRateLimit: false,
+      }
+    );
+
+    expect(markdown).toContain("| 24h total AIC | 0 |");
+    expect(markdown).toContain("| Runs counted | 0 |");
+    expect(markdown).toContain("| Avg AIC / run | — |");
+    expect(markdown).toContain("| Std dev AIC | — |");
+    expect(markdown).toContain("| Min / Max AIC | — / — |");
+    expect(markdown).toContain("| _none_ | — | — | 0 |");
+    expect(markdown).not.toContain("| 24h total AIC |  |");
+    expect(markdown).not.toContain("| Avg AIC / run |  |");
+    expect(markdown).not.toContain("| Min / Max AIC |  /  |");
+  });
+
   it("renders a daily AI Credits details summary with stats and prior runs", () => {
     const markdown = exports.renderDailyAICSummary(
       "Nightly triage",